it's nothing special at all really, just a little idea
ahh whatever here I'll just post it
effect: four coins are placed under a card, and with the wave of a hand, or snap of ur fingers, or whatever u prefer, the one of the coins instantly disappears from under the card, to be found under another card set aside, or whatever you have available.
preparation: none, just need to know how to do classic palm
-show four coins on your right palm. Prod one of them into position for classic palm, under the cover of counting the coins and explaining that their just regular quarters or half-dollars or whatever they are(all four must be the same coin of course).
-throw the coins into your left hand, but keeping the one coin palmed in your right, then immediately close your left fist over the three coins. pick up a single card with ur right hand (coin still palmed in it), any card it doesn't matter, place the three coins in your left hand onto the table and immediately place the card over them. Do this all in one quick motion, making sure the spectator has no time to notice that only three cards were placed under the card.
-use patter to give a reason for the card, say its a special card that gives the coins teleporting powers, or that the shadow from the card causes the coins to escape, whatever suits you
-spec now thinks theres four coins in under the card, but you really have one of em in your hand. the rest is up to you
nothing super really, I was just thinking, after you do an effect like the matrix and you have a couple coins and cards left over, instead of putting em away right after why not another little gimmick-free effect involving the same materials. It's good practice for classic palm too
sorry if i disappointed you
what do you tihnk though? oh and if this idea already exists please tell me